The lungs and the heart. Colour mezzotint by J.F. Gautier d'Agoty, 1754.

Jacques-Fabien Gautier d'Agoty published a series of anatomical engravings using a colour mezzotint process which had first been developed by Jacob Christoph Le Blon (1667-1741), in whose workshop Gautier d'Agoty had served as an assistant. In 1737, Le Blon obtained a copyright to publish a complete colour anatomy atlas, which never appeared. To Le Blon's process, which used the three colours of red, yellow and blue, Gautier d'Agoty added black and claimed the process to be his own invention. Plates in the Anatomie générale were executed by Gautier D'Agoty after both his own dissections (as in this case) and after those by J.C. Mertrud